/*******************************************************************************
 * Copyright (c) 2010-2011 Robert Fraser                                       *
 *                                                                             *
 * Permission is hereby granted, free of charge, to any person obtaining a     *
 * copy of this software and associated documentation files (the "Software"),  *
 * to deal in the Software without restriction, including without limitation   *
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,    *
 * and/or sell copies of the Software, and to permit persons to whom the       *
 * Software is furnished to do so, subject to the following conditions:        *
 *                                                                             *
 *   - The above copyright notice and this permission notice shall be included *
 *     in all copies or substantial portions of the Software.                  *
 *                                                                             *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR  *
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,    *
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE *
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER      *
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING     *
 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER         *
 * DEALINGS IN THE SOFTWARE.                                                   *
 *******************************************************************************/

using System.Collections.Generic;
using System.ComponentModel;
using System.Diagnostics;

namespace zeal.core
{
    public abstract class TexturePort : INotifyPropertyChanged
    {
        private readonly TextureNode _node;
        protected TexturePort(TextureNode node) { _node = node; }

        public TextureNode node { get { return _node; } }
        public abstract TexturePortInfo portInfo { get; }
        public abstract IEnumerable<TexturePort> connected { get; }
        public bool isVariableType { get { return portInfo.type.isVariable; } }
        internal void onTypeChanged() { notifyPropertyChanged("type"); }

        public TextureType type
        {
            get
            {
                if (isVariableType)
                {
                    TexturePixelType? pType = node.groupType;
                    Debug.Assert(pType.HasValue, "Nodes containing a group-typed port must have a group type");
                    // ReSharper disable PossibleInvalidOperationException
                    return new TextureType(portInfo.type.dataType, pType.Value);
                    // ReSharper restore PossibleInvalidOperationException
                }
                else
                {
                    return portInfo.type;
                }
            }
        }

        public override string ToString() { return string.Format("{0}.{1}", node.info.name, portInfo.name); }

        // INotifyPropertyChanged implementation
        public event PropertyChangedEventHandler PropertyChanged;
        private void notifyPropertyChanged(string propertyName)
        {
            PropertyChangedEventHandler handler = PropertyChanged;
            if (null != handler) handler(this, new PropertyChangedEventArgs(propertyName));
        }
    }
}